How to hide the border around child window

I have a child Window , and I am displaying it from the code behind as below:

ChildPhotoViewer PhotoViewer = new ChildPhotoViewer();
                PhotoViewer.DataContext = selectedPhoto;
                PhotoViewer.Title = selectedPhoto.strTitle.ToString();
                PhotoViewer.Show();

But While Displaying the child window I am getting the Close Button and a Border thickness arround the Window.

I am able to hide the Close Button but is there a way to hide the thickness(Border) across the child window.

Edit:

![alt text][1]

In the Image , there is border arround image after Collpasing the Close button and making

PhotoViewer.Title = null;
PhotoViewer.HasCl开发者_运维技巧oseButton = false;

I want to get rid of that Rectangular Border.

Have you tried:-

PhotoViewer.BorderThickness = new Thickness(0);

PhotoViewer.Title = null;
PhotoViewer.HasCloseButton = false;

Edit

Third attempt.

The template for ChildWindow place the content in border with a 7 pixel margin. This also has an outer border which has a White background. That is what you are seeing in the image. The only way to eliminate it is to copy the ChildWindow template and edit it.

Depends on what you mean by the Border.

If you have a look at the Documentation you can see there is a border (with a thickness of 1) around the edge of the entire window that can be altered like Anthony mentions.

However there is also the window Chrome which in the default template has a number of borders. To change the thickness of these borders you will need to create a style without the borders being present.